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tool: ifwitool: Fix buffer overflow 

An incorrect 1st parameter is passed to the fix_member()
 function. Should use a pointer to the beginning of the parent structure
 (bpdt or subpart_dir, because are boxed), not to their fields. Otherwise,
 this leads to an overrun of the structure boundary, since in the
 fix_member() function, an 'offset' is made, relative to the 1st argument,
 which itself is an 'offset' from the beginning of the structure.

Signed-off-by: Mikhail Ilin <ilin.mikhail.ol@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Mikhail Ilin 2022-11-18 14:50:24 +03:00 committed by Tom Rini
parent 164232943c
commit 2d1b2ac13f
1 changed files with 19 additions and 25 deletions
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44
tools/ifwitool.c
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@ -1441,23 +1441,20 @@ static void bpdt_fixup_write_buffer(struct buffer *buf)
size_t offset = 0;
offset = fix_member(&h->signature, offset, sizeof(h->signature));
offset = fix_member(&h->descriptor_count, offset,
sizeof(h->descriptor_count));
offset = fix_member(&h->bpdt_version, offset, sizeof(h->bpdt_version));
offset = fix_member(&h->xor_redundant_block, offset,
sizeof(h->xor_redundant_block));
offset = fix_member(&h->ifwi_version, offset, sizeof(h->ifwi_version));
offset = fix_member(&h->fit_tool_version, offset,
sizeof(h->fit_tool_version));
offset = fix_member(&s, offset, sizeof(h->signature));
offset = fix_member(&s, offset, sizeof(h->descriptor_count));
offset = fix_member(&s, offset, sizeof(h->bpdt_version));
offset = fix_member(&s, offset, sizeof(h->xor_redundant_block));
offset = fix_member(&s, offset, sizeof(h->ifwi_version));
offset = fix_member(&s, offset, sizeof(h->fit_tool_version));
uint32_t i;
for (i = 0; i < count; i++) {
offset = fix_member(&e[i].type, offset, sizeof(e[i].type));
offset = fix_member(&e[i].flags, offset, sizeof(e[i].flags));
offset = fix_member(&e[i].offset, offset, sizeof(e[i].offset));
offset = fix_member(&e[i].size, offset, sizeof(e[i].size));
offset = fix_member(&s, offset, sizeof(e[i].type));
offset = fix_member(&s, offset, sizeof(e[i].flags));
offset = fix_member(&s, offset, sizeof(e[i].offset));
offset = fix_member(&s, offset, sizeof(e[i].size));
}
}
@ -1657,24 +1654,21 @@ static void subpart_dir_fixup_write_buffer(struct buffer *buf)
size_t count = h->num_entries;
size_t offset = 0;
offset = fix_member(&h->marker, offset, sizeof(h->marker));
offset = fix_member(&h->num_entries, offset, sizeof(h->num_entries));
offset = fix_member(&h->header_version, offset,
sizeof(h->header_version));
offset = fix_member(&h->entry_version, offset,
sizeof(h->entry_version));
offset = fix_member(&h->header_length, offset,
sizeof(h->header_length));
offset = fix_member(&h->checksum, offset, sizeof(h->checksum));
offset = fix_member(&s, offset, sizeof(h->marker));
offset = fix_member(&s, offset, sizeof(h->num_entries));
offset = fix_member(&s, offset, sizeof(h->header_version));
offset = fix_member(&s, offset, sizeof(h->entry_version));
offset = fix_member(&s, offset, sizeof(h->header_length));
offset = fix_member(&s, offset, sizeof(h->checksum));
offset += sizeof(h->name);
uint32_t i;
for (i = 0; i < count; i++) {
offset += sizeof(e[i].name);
offset = fix_member(&e[i].offset, offset, sizeof(e[i].offset));
offset = fix_member(&e[i].length, offset, sizeof(e[i].length));
offset = fix_member(&e[i].rsvd, offset, sizeof(e[i].rsvd));
offset = fix_member(&s, offset, sizeof(e[i].offset));
offset = fix_member(&s, offset, sizeof(e[i].length));
offset = fix_member(&s, offset, sizeof(e[i].rsvd));
}
}